test classes and fix for #615, inferring return type if not specified…

… in annotations

modules/swagger-jaxrs/src/main/scala/com/wordnik/swagger/jaxrs/JaxrsApiReader.scala

@@ -112,7 +112,7 @@ trait JaxrsApiReader extends ClassReader with ClassReaderUtils {
   ) = {
     val api = method.getAnnotation(classOf[Api])
     val responseClass = {
-      if(apiOperation != null){
+      if(apiOperation != null && !classOf[Void].equals(apiOperation.response)){
         val baseName = processDataType(apiOperation.response, apiOperation.response)
         val output = apiOperation.responseContainer match {
           case "" => baseName

modules/swagger-jaxrs/src/test/scala/ResourceWithReturnTypesTest.scala

@@ -0,0 +1,24 @@
+import testresources.ResourceWithReturnTypes
+
+import com.wordnik.swagger.config.SwaggerConfig
+import com.wordnik.swagger.jaxrs.reader.DefaultJaxrsApiReader
+import com.wordnik.swagger.core.util.JsonSerializer
+
+import org.junit.runner.RunWith
+import org.scalatest.{Matchers, FlatSpec}
+import org.scalatest.junit.JUnitRunner
+
+@RunWith(classOf[JUnitRunner])
+class ResourceWithReturnTypesTest extends FlatSpec with Matchers {
+  it should "read an api and extract the return type" in {
+    val reader = new DefaultJaxrsApiReader
+    val config = new SwaggerConfig()
+    val apiResource = reader.read("/api-docs", classOf[ResourceWithReturnTypes], config).getOrElse(fail("should not be None"))
+
+    val operations = apiResource.apis.head.operations
+
+    operations.size should be (1)
+    val op = operations.head
+    op.responseClass should be ("Howdy")
+  }
+}

modules/swagger-jaxrs/src/test/scala/testresources/ResourceWithReturnTypes.java

@@ -0,0 +1,27 @@
+package testresources;
+
+import testmodels.*;
+import com.wordnik.swagger.core.*;
+import com.wordnik.swagger.annotations.*;
+
+import javax.ws.rs.*;
+import javax.ws.rs.core.Response;
+
+import javax.xml.bind.annotation.*;
+
+@Path("/basic")
+@Api(value = "/basic", description = "Basic resource")
+public class ResourceWithReturnTypes {
+  @GET
+  @Path("/{id}")
+  @ApiOperation(value = "Find by ID")
+  @ApiResponses(value = { @ApiResponse(code = 400, message = "Invalid ID supplied"),
+      @ApiResponse(code = 404, message = "Pet not found") })
+  public Sample getTest(
+    @ApiParam(value = "sample param data", required = true, allowableValues = "range[0,10]")@DefaultValue("1") @QueryParam("id") String id) {
+    Sample out = new Sample();
+    out.setName("foo");
+    out.setValue("bar");
+    return out;
+  }
+}